As far as flashy probably the sorcerers (and enchanters were a nice twist to mages) on RYL..they can summon a tornado and shit xD its really cool but their kind of slow and can be a bit harder than the other classes to keep up with..but if played right their great.
the runeoffs were cooler though cuz they have scythes and personally I liked life-offs cuz they had a sort of stun debuff heal trio going on :) pretty deadly beside a warrior.
Mages in cabal are fairly flashy of course but I didn't like em as much for some reason..

